变化导航的图片

下面为效果显示

脚本说明:
把如下代码加入<body>区域中
<script language="JavaScript1.2">

//Drop-in slideshow II (hyperlinked)- By Dynamic Drive
//For full source code and more DHTML scripts, visit http://www.dynamicdrive.com
//This credit MUST stay intact for use

var slideshow_width=88 //SET SLIDESHOW WIDTH (set to largest image's width if multiple dimensions exist)
var slideshow_height=31 //SET SLIDESHOW HEIGHT (set to largest image's height if multiple dimensions exist)
var pause=3000 //SET PAUSE BETWEEN SLIDE (2000=2 seconds)

var dropimages=new Array()
//SET IMAGE PATHS. Extend or contract array as needed
dropimages[0]="button1.gif"
dropimages[1]="button2.gif"
dropimages[2]="button3.gif"

var droplinks=new Array()
//SET IMAGE URLs. Extend or contract array as needed
droplinks[0]="http://www.7stk.com"
droplinks[1]="http://www.7stk.com"
droplinks[2]="http://www.7stk.com"

////NO need to edit beyond here/////////////

var preloadedimages=new Array()
for (p=0;p<dropimages.length;p++){
preloadedimages[p]=new Image()
preloadedimages[p].src=dropimages[p]
}

var ie4=document.all&&navigator.userAgent.indexOf("Opera")==-1
var dom=document.getElementById&&navigator.userAgent.indexOf("Opera")==-1

if (ie4||dom)
document.write('<div style="position:relative;width:'+slideshow_width+';height:'+slideshow_height+';overflow:hidden"><div id="canvas0" style="position:absolute;width:'+slideshow_width+';height:'+slideshow_height+';top:-'+slideshow_height+'"></div><div id="canvas1" style="position:absolute;width:'+slideshow_width+';height:'+slideshow_height+';top:-'+slideshow_height+'"></div></div>')
else
document.write('<a href="javascript:rotatelink()"><img name="defaultslide" src="'+dropimages[0]+'" border=0></a>')

var curpos=slideshow_height*(-1)
var degree=10
var curcanvas="canvas0"
var curimageindex=0
var nextimageindex=1

function movepic(){
if (curpos<0){
curpos=Math.min(curpos+degree,0)
tempobj.style.top=curpos
}
else{
clearInterval(dropslide)
nextcanvas=(curcanvas=="canvas0")? "canvas0" : "canvas1"
tempobj=ie4? eval("document.all."+nextcanvas) : document.getElementById(nextcanvas)
tempobj.innerHTML='<a href="'+droplinks[curimageindex]+'"><img src="'+dropimages[curimageindex]+'" border=0></a>'
nextimageindex=(nextimageindex<dropimages.length-1)? nextimageindex+1 : 0
setTimeout("rotateimage()",pause)
}
}

function rotateimage(){
if (ie4||dom){
resetit(curcanvas)
var crossobj=tempobj=ie4? eval("document.all."+curcanvas) : document.getElementById(curcanvas)
crossobj.style.zIndex++
var temp='setInterval("movepic()",50)'
dropslide=eval(temp)
curcanvas=(curcanvas=="canvas0")? "canvas1" : "canvas0"
}
else
document.images.defaultslide.src=dropimages[curimageindex]
linkindex=curimageindex
curimageindex=(curimageindex<dropimages.length-1)? curimageindex+1 : 0
}

function rotatelink(){
window.location=droplinks[linkindex]
}

function resetit(what){
curpos=slideshow_height*(-1)
var crossobj=ie4? eval("document.all."+what) : document.getElementById(what)
crossobj.style.top=curpos}

function startit(){
var crossobj=ie4? eval("document.all."+curcanvas) : document.getElementById(curcanvas)
crossobj.innerHTML='<a href="'+droplinks[curimageindex]+'"><img src="'+dropimages[curimageindex]+'" border=0></a>'
rotateimage()
}

if (ie4||dom)
window.onload=startit
else
setInterval("rotateimage()",pause)

</script>